@article{SF_1992__44_1_135144,
     author = {S.D. Hippisley-Cox},
     title = {On the structure of certain po-semigroups.},
     journal = {Semigroup forum},
     pages = {213--220},
     publisher = {mathdoc},
     volume = {44},
     number = {1},
     year = {1992},
     zbl = {0759.22006},
     url = {http://geodesic.mathdoc.fr/item/SF_1992__44_1_135144/}
}